Recommended Practice: Lighting Library Spaces
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ANSI/IES RP-4-26
Document Type: Recommended Practice (RP)
Available as a downloadable secure PDF only.
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Product Description
Intended Audience: Designers, architects, engineers, users, general public, environmentalists, utilities, library administrators, librarians, educators.
Intended Interest Categories: Specifier (US), Affected (UA), Public Interest (UP), Academic, Research (GAR), Government, Regulatory (GGR), General SME (GSME), Organizational (OM).
Description: Best practices to light libraries and library spaces. The 2026 revision includes updates and additions for Daylighting, Controls, and new images. The changes harmonize this standard with ANSI/IES RP-1-24.
Page count: 58 pages
Publisher: Illuminating Engineering Society (2026)
SKU: ANSI/IES RP-4-26
ISBN: 978-0-87995-518-2
Previous edition: RP-4-20
Chapters:
- 1.0 Introduction and Scope
- 2.0 General Considerations
- 3.0 Types of Libraries and Tasks
- 4.0 Lighting Methodologies for Libraries
- 5.0 Area Specific Considerations
- 6.0 Exterior Lighting
- Annex A – Illuminance Recommendations
- Annex B – Stack Lighting Design Options
- Annex B – Additional Resources
- Annex B – Project Design Credits
Citation Format:
Illuminating Engineering Society. ANSI/IES RP-4-26, Recommended Practice: Lighting Library Spaces. New York: IES; 2026.